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## Main Question or Discussion Point

Hello all,

This one thought came to my mind just now. What's the physical significance of signal representation in negative time, i mean second and third quadrant.

So for example, sin(t) and sin(t).u(t) aren't they same for all practical purposes?

I know, mathematically they are different. But I'm trying to visualize the difference in terms of practical usage.

This one thought came to my mind just now. What's the physical significance of signal representation in negative time, i mean second and third quadrant.

So for example, sin(t) and sin(t).u(t) aren't they same for all practical purposes?

I know, mathematically they are different. But I'm trying to visualize the difference in terms of practical usage.